Apart from using a spot colour what is the best practise? Where can I go to find this sort if thing? Google just thinks you're trying to print with fluorescent inks on an actual garment, I'm looking for tips on how to print an image of one.

You cheat with the lighting. Retouch the photo in photoshop, darken and/or add the opposite colour to your fluorescent into your background, obviously you can only go so far where there are skin tones but its surprising how much they can take.

No not really increasing the contrast. You are creating an optical illusion. A lot of how your brain perceives colour is by comparison, and little to do with numbers read by spectrophotometers in isolated areas.